c# create barcode 3: EA Framework Design Patterns in Objective-C

Generator QR Code in Objective-C 3: EA Framework Design Patterns

CHAPTER 3: EA Framework Design Patterns
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This is where the problems start. First, the original system design that John implemented was for one particular printer, and while it would have been nice to design and implement it thinking forward to the likely scenario that other printer designs might come along, there was no budget for that so it was not done. Second, because John had only a short time to perform integration testing, and this was done at night under severe time constraints, John failed to completely document the last minute fixes to get things working. When Chris reviews the code to see what s going on, things don t seem to line up. While the documentation and comments say one thing, the code appears to do something else. So Chris has to dissect the code and basically rebuild it from what John has left behind. The comments, because they don t accurately reflect the actual software build, actually cause more work to be done. Chris has to pretty much verify or disprove each comment. In essence, it becomes better for him to completely toss the comments and reconstruct everything directly from the code. NOTE: A software build is a released version of the operational program being used by its intended customers. For example, you can see the software build of your Mac by clicking on the apple and selecting About This Mac. Then select More Info and click software. You will see something like: Mac OS X 10.6.1 (10B504) where the numbers/letters in parentheses represent the build number. Chris can select from two options: try to modify the original code to work with the new system or create a new set of software from scratch, this time avoiding the problems that his predecessor left behind, which is unlikely. Experienced programmers from back in the day know the rest of the story here. You never get the money to redesign the system the right way. Your marching orders are just make it work and we ll get the money to fix things next year. Think that money will actually come next year Without reliving some of my own past nightmares, I think we can all see where this is going. So what do you do This is where the miracle of OOP comes in to save us functional programming heathens. We pray at the church of OOP, say twenty Hail reuse and we re cleansed of our functional filth. Well, not exactly.
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The Basics of OOP
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Through OOP you can create systems that consist of objects. Each object has properties and methods and they interact. And basically, that s it.
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CHAPTER 3: EA Framework Design Patterns
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Sure, there are things like information hiding, polymorphism, inheritance, modularity, encapsulation, and data abstraction, but those are just details about the objects, the properties, and methods. Think about the real world you and me and everyone else. Within the definition of OOP, each individual is an object. We have properties like sex, hair color, height, and so on. We also have things we do, or methods, eating, sleeping, working, and so on. We also interact. A person might call the eat dinner method on the members of her family: her spouse and children as well as herself. Take a step back and instead of saying that each person is an object, let s say that an object is a human being. We list all the common properties of humans as well as their methods the things they can do. So what is Jane Jane is an instance of the human object, just as is Adam, Paul, Julie, and every single individual that ever lived or ever will live; one of the properties could be isAlive . Enough with the abstraction already, you see that the OOP model works at large, but how about for a particular problem Let s go back to the printer product line. You have objects such as printer, conveyor, switch (to move from one line to another), workstation, and so on. You could also have object instances that come and go: worker ID #1334, worker ID #2227, and so on. This will get really ugly quickly if continued, so let s conclude with looking at a specific object example, the workstation object (see Figure 3 1).
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